This indicated that the leaching of Co from the Co ore was controlled by an interfacial chemical reaction, and then the developed leaching kinetics model of the Co can be expressed as $1-\ $ × t. Cobalt in nickel ores is recovered during refining. The stock solution is then diluted to 250.0 mL in a volumetric flask (assuming the solution has a density. The leaching kinetics of Co showed that the apparent activation energy of Co leaching was 76.07 kJ/mol (i.e., in the range of 40–300 kJ/mol). Cobalt is a brittle, hard, transition metal with magnetic properties similar to those of iron. cobalt ore is crushed and digested in IM HNO3. The results revealed that the leaching ratio of Co can reach up to 95.61% using (NH 4) 2SO 4 as a leaching agent under the following materials and conditions: (NH 4) 2SO 4 concentration 300 g/L, reductant dosage 0.7 g, leaching temperature 353 K, reaction time 4 h, and liquid–solid ratio 6 mL/g. This process was simple and environmentally friendly. An ammonia-based system was used to selectively leach cobalt (Co) from an African high-silicon low-grade Co ore, and the other elemental impurities were inhibited from leaching in this process.
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